The start and end arguments should be unsigned long in setSelectionRange() function

Source/core/html/HTMLTextAreaElement.idl

Index: Source/core/html/HTMLTextAreaElement.idl
diff --git a/Source/core/html/HTMLTextAreaElement.idl b/Source/core/html/HTMLTextAreaElement.idl
index ea7ca760f41738b09f32065c1b6f22482c9260d9..681b32faadb10b2b868d42d34d4d5d19aab21e7d 100644
--- a/Source/core/html/HTMLTextAreaElement.idl
+++ b/Source/core/html/HTMLTextAreaElement.idl
@@ -62,10 +62,8 @@ interface HTMLTextAreaElement : HTMLElement {
                                         unsigned long start,
                                         unsigned long end,
                                         optional SelectionMode selectionMode = "preserve");
-    // TODO(philipj): The start and end arguments should be unsigned long and
-    // should not be optional.
-    void setSelectionRange([Default=Undefined] optional long start,
-                           [Default=Undefined] optional long end,
+    void setSelectionRange(unsigned long start,
+                           unsigned long end,
                            optional DOMString direction);
 
     // HTML autocapitalize proposal